Do you think that it would be better to 1st go over all of the install steps again
My advice - uninstall it and forget about it. I am a big fan of Google in most things, but Google Checkout is total rubbish. And I'm not referring to any available Google Checkout payment module but to Google Checkout itself.

I have used their system as a customer once and will never use it again - "klunky" doesn't even begin to describe it.

I suspect that many people want to use it just to get the Google Checkout button next to their Google Ads, provided the Google Checkout module they are using is fully compliant with all of Google's rules and regs. But there are so many better payments systems - even PayPal is better than Google Checkout.

At least that's my opinion.

Vger